Simplest way to do what u whant is use this (itzverified) member verification 4.1.0 hook - tested, works fine after few moment configuration.
Other way is make a group, eg Verified, add icon to this group ( first method is use custom group icon, second use custom member icon ), add verified icon to grup - tested, works but not perfectly as i think it be.
Last is editing postContainer and add something like this:
Code:
{expression="\IPS\Member\Group::load( $comment->author()->group_id)->formattedName" raw="true"}</li>
{{if \IPS\Member\Group::load( $comment->author()->group_id )->your_icon_path }}Last is not tested but should work, i think
